Multiply modules with one source (or even zero sources) work, but aren't particularly useful.
If you are using the included XML noise configuration system, Multiply modules can be declared as
<multiply> ...source modules... </multpliy>
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* @throws BuilderException * if any of the source modules throws an exception. * @see ModuleBuilder#createModule() */ public Multiply createModule () throws BuilderException { return new Multiply (createSources ()); }